CS243776B1 - Device to prevent exceeding the maximum permissible water temperature in the boilers for solid, hot - Google Patents

Abstract

The device is designed to protect solid fuel boilers against overheating. It is activated in the event of a power failure or to open the boiler thermostat contacts, which are connected in the power supply circuit of the reversing solenoid valve and the bypass solenoid valve, which control the water supply to the tank and the drain from it. The tank opens the secondary air supply door by means of a lever mechanism, and also opens the chimney flap, sweep door and flood flaps, and closes the choke. The device operates independently of the power control method, and after the cause of its reaction has disappeared, it automatically returns to its normal operating state and allows the boiler to continue operating.

Description

4 243776

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for protecting explosives against solid fuel. In order to prevent overheating in hot-water boilers, melting plugs are used, which have a cavity sealed with a suitable metal, and when the specified temperature is reached, the metal is melted so that hot water escapes from the boiler. The disadvantage of melting plugs is that when the temperature drops below the highest allowable temperature sasams will not close, but they will have to be replaced. Furthermore, automatic control devices comprising a thermal sensor, a regulator and a servo-motor, controlling the supply of the back air to the boiler, are known to avoid exceeding the set water boiler temperature. A disadvantage of such a device is that, in the event of a power failure or failure, the possibility of overheating is not prevented. To avoid exceeding the highest permissible temperature of the water content of the boiler, a device utilizing the volumetric expansion of the liquid is known to control the valve through which the hot water is discharged from the boiler through the middle of the float. A drawback of this device is that its installation requires considerable burdens on the construction of the boiler and that water is lost in the hot water system.

The apparatus of the invention is free of the above-mentioned drawbacks. Its essence is that it hangs from the boiler thermostat, the contacts of which are connected in the power supply circuit by the electric energy of the reverse solenoid valve and the direct solenoid valve, the reservoir or pneumatic actuator, and the mechanical connection by the secondary air inlet, optionally with swabs and chimney flap. Above all, the advantage of the device is that it prevents overheating even in the event of a power failure, and thus circulation pumps, and after its renewal will enable the boiler to continue to operate uninterruptedly.

In contrast to known overheating solutions, in this solution, there is no loss of water in the hot water system and its application does not require any major interference with the boiler structure and is independent of the boiler power control. An indispensable advantage of the device is its design and maintenance simplicity.

The apparatus of the invention is shown schematically in the attached drawing. Its basis is a control rod 1, a rotatable bearing of sliding or rolling bearings 2, on which the lever system 3 is placed. A lever 12 is attached to the control rod, which opens by means of a downward movement against the spring force or weight 13 the cables 4, the pulleys S and the bowden cables B, the discharge door 7, the door 8 for supplying the secondary air, possibly also the chimney flap 10 and the flaps 11, and closes the choke 9. The spring 13 provides a stable position During the normal operation and its reversibility, they will be latched to the operating position after the cause of the reaction of the device has disappeared. The task of the spring 14 on the girder actuating chamber flap 10 is to allow the lever 12 to move downwards, even when the chimney flap is fully open. During normal operation, the output of the boiler is controlled by controlling the choke 9, by means of a rod 1B either manually, by a thrust regulator or by a servo-motor. The role of the spring 15 on the rod 16 is to allow the choke to be closed even when it is opened at the moment of reaction of the device.

The control rod 1 is actuated by a lever 12 by the following method. On the bar 12 there is a rotatably mounted reservoir 17 provided with a float valve 18 at the bottom of the reservoir through which the reservoir is connected by a flexible valve 19 to the solenoid valve 20 with a reversible function. In the case of electronic power and a closed contact thermostat, the reverse solenoid valve 20 closes the water supply from the water main. In the event of a power failure or disconnection of the boiler thermostat contacts from the temperature rise point above the set temperature, which is connected in the coil feeding circuit of the reverse coil valve 20 and solenoid valve 21, the water supply to the tank is opened by opening the reverse solenoid valve 20 and by closing the drain with a solenoid valve 21. The accumulation of water in the reservoir, the reservoir increases its weight against the positioning of the spring force 13, the weight of the open door and the friction resistances downward to the stop 22 and performs the above specified operations. The amount of water flowed into the reservoir is limited by the float valve 18 and is adjustable as required. Upon termination of the cause of the device response, the reverse solenoid valve 20 closes the water inlet and simultaneously opens the sole-valve valve 21 through which the water from the reservoir and the spring 13 bring the post-operating device.

If there is a compressed air distribution system at the boiler installation, the compressed air actuator can be replaced with a compressed air actuator, using solenoid valves.

Claims (1)

SUBJECT Device for preventing exceeding the maximum permissible water temperature in solid fuel boilers, characterized in that it consists of a boiler thermostat whose contacts are connected in the power supply circuit of the reverse solenoid valve (20) and the straight solenoid valve (21), the reverse solenoid valve (20J BACKGROUND OF THE INVENTION connects a pressure fluid source to a reservoir (17) and a direct solenoid valve (21) connects the waste to a reservoir (17) which is connected to the choke (9) and the door or boiler flaps that are in its normal operating mode in closed position.